great info on the PTC. I too went through the wiper motor ordeal. After the dealer said I needed a new motor $95 to diagnose, $300 motor and $300 to install...I laughed and went home. Only to eventually come back and buy the motor from the dealer. I installed the thing and guess what. Didn't work. I studied the wiring diagrams and decided that it was likely a ground. But, in search of the ground problem, I decided to replace the washer motor since in the wiring diagram the washer motor is a critical element in the circuit and a short in the washer can ruin the works. So, new headlight washer pump and viola! Everything works!

Not so fast. NOW, the passenger side wiper will stall out after three or four presses of the washer stalk (cycles). Washer fluid still comes out but the passenger side wiper stalls at 12 o'clock position. Letting it cool down and recycling (ignition and headlights) gets it back to normal.

My question is this: with a new motor could the PTC be bad or would there be any reason to suspect an overvoltage / overamperage through the PTC...but I thought this was "thermal" resistor. Any ideas?

I may be glad I bought the motor at the dealer as I am about to test the MB 12mo warranty on factory parts! HA.

Any thoughts are welcome.